What is operator overloading?

Short answer: Defining custom behavior for operators (+, -, *, etc.) for a class. class Point

Example code

{
public int X, Y;
public static Point operator +(Point a, Point b) => new Point {
X = a.X + b.X, Y = a.Y + b.Y };
}

Real-world example (ShopNest)

Think of ShopNest’s Product, Cart, and Order classes: each object holds data + behavior, so pricing rules stay next to the data they use.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.